3'5 Active Transport, Endocytosis, and Exocytosis

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3.5 Active Transport, Endocytosis, and Exocytosis
KEY CONCEPT Cells use energy to transport
materials that cannot diffuse across a membrane.
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3.5 Active Transport, Endocytosis, and Exocytosis
Active transport requires energy input from a
cell and enables a cell to move a substance
against its concentration gradient.

• Passive transport requires no energy from the
  cell.

• Active transport is powered by chemical energy
  (ATP).

• Active transport occurs through transport protein
  pumps.

• Cells use active transport to maintain
  homeostasis.

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3.5 Active Transport, Endocytosis, and Exocytosis
A cell can import and export large materials or
large amounts of material in vesicles during the
processes of endocytosis and exocytosis.

• Cells use energy to transport material in
  vesicles.

• Endocytosis is the process of taking material
  into the cell.

• Phagocytosis is a type of endocytosis.

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3.5 Active Transport, Endocytosis, and Exocytosis
A cell can import and export large materials or
large amounts of material in vesicles during the
processes of endocytosis and exocytosis.

• Cells use energy to transport material in
  vesicles.

• Exocytosis is the process of expelling material
  from the cell.